You need to complete the Pokemon league
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Snowpoint city at the top of shinno Pokemon daimond & Pearl
They are near Snowpoint City in Pokemon Diamond Pearl.
That is only in diamond, platinum and pearl.
beat the elite 4 then go back to the boat
If you don't have the National Pokedex and you take the boat from Snowpoint city then you can only challange the Battle Frontier, but once you have the National Pokedex you can get to the Resort Area and the Survival Area.